1 / 8

Work and Energy

Work and Energy. I should understand and be able to apply the work-energy theorem, so I can: (1) Calculate the change in kinetic energy or speed that results from performing a specified amount of work on an object.

addo
Download Presentation

Work and Energy

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Work and Energy I should understand and be able to apply the work-energy theorem, so I can: (1) Calculate the change in kinetic energy or speed that results from performing a specified amount of work on an object. (2) Calculate the work performed by the net force, or by each of the forces that make up the net force, on an object that undergoes a specified change in speed or kinetic energy. (3) Apply the theorem to determine the change in an object’s kinetic energy and speed that results from the application of specified forces, or to determine the force that is required in order to bring an object to rest in a specified distance.

  2. Work

  3. Energy Mechanical Energy Chemical Energy Heat Energy Electrical Energy Electromagnetic Energy Nuclear Energy

  4. Work Energy Theorem Work is the thing that changes the kinetic energy of an object Positive work increases kinetic energy Negative work decreases kinetic energy

  5. Work and Energy Net Work: work done by all forces acting on an object

  6. Work and Energy What is the net work being done on an object moving at a constant velocity?

  7. A 5 kg box is pushed by a 80 N force over a distance of 10 m. The coefficient of friction between the box and the ground is 0.5. a. How much work is done by the normal force? b. How much work is done by the force of gravity? c. How much work is done by the 80 N force? d. How much work is done by friction?

  8. A 5 kg box is pushed by a 80 N force over a distance of 10 m. The coefficient of friction between the box and the ground is 0.5. e. What is the net work being done on the object? f. Why is the net work less than the work done by the 80 N force? g. If the block started from rest, what is its final velocity at the end of the 10m?

More Related